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Biomedical subjects

G L Cluff

Publications and source records attributed to G L Cluff.

7 recordsLinked to original sources
PubMed1990

Positional stability of five insert-type hearing protectors as a function of controlled jaw movement.

Five insert-type hearing protectors (three viscose foam, one multiflanged, and one glass fiber) were evaluated for lateral drift in the ear canal as a result of 30 min of controlled jaw movement. The lateral drift was compared to changes in attenuation for the same protectors over the same duration of jaw movement. The ranked correlation of positional and attenuation stability was very low (Spearman Rho = 0.3). Possible explanations for this observation are discussed.

Ear Protective Devices↗
PubMed1989

Insert-type hearing protector stability as a function of controlled jaw movement.

Samples of five insert-type hearing protectors (three viscose foam, one poly-flanged, and one glass fiber) were evaluated for change in attenuation as a result of 30 min of controlled jaw movement. Protected-ear, narrow-band noise thresholds were obtained at octave intervals (between 0.25 and 4.0 kHz) before and after the jaw-movement activity. Frequency and interaction effects were not significant. Protector effects were significant beyond the 0.01 level of probability that chance caused the observed differences. As a group, the viscose foam protectors were more stable than the others. The most stable protector was E.A.R., and the least stable was Bilsom Soft.

Adult↗
PubMed1986

The effects of protector-noise interaction on the accuracy of the NRR estimate of hearing protector attenuation.

A total of 262 noise spectra were divided empirically into three groups and the accuracy of the NRR estimate of hearing protector attenuation was evaluated for each group using 15 hearing protectors. The mean and the standard deviation of the error in the NRR estimate was most stable across the 15 protectors, when noise spectra were characterized by a simple monotonic band-level function yielding a dBC-dBA difference of 3.5 dB or less. Both the octave band attenuation function of the hearing protector and the octave band spectrum of the noise appeared to contribute to the error in the NRR estimate.

Ear Protective Devices↗
PubMed1986

Suggested standard hearing protector attenuation function relating to the NRR.

An assumption was made that a hearing protector (HP) attenuation function derived from some combination of the A-weights and C-weights used in the calculation of the NRR would produce a minimum difference between the NIOSH long R-value and the NRR-dBC + dBA + 3 (RNRR), regardless of the spectrum of the noise. Four hypothetical HP attenuation functions were derived. A mean R-RNRR difference, standard deviation and range were determined for these functions and for five real HP functions using 262 noise spectra. The mean R-RNRR difference for one of the hypothetical functions ("ED") was zero, with a standard deviation of .2 dB and a range of 1.6 dB. It was concluded that an HP designed to match the "ED" attenuation function would minimize the R-RNRR difference, regardless of the noise spectrum.

Humans↗
PubMed1983

After the hearing test--what then?

The credibility of industrial hearing test data should be established before it is evaluated for follow-up action. Once this is done, subsequent evaluation should determine 1) whether or not there is need for referral to a professional, 2) whether or not there has been a significant threshold shift (STS), and 3) provide for necessary within-company administrative follow-up, as appropriate. Caution should be used in releasing data to employees; however such release should be prompt and complete. Use of the term 'normal hearing' should be minimized; with 'satisfactory hearing' being substituted. Use of this term should include the criteria upon which it is based. There is some confusion on what is not meant by STS, and specific criteria pertaining thereto have been recommended. Using a computer to assist in the above processes can result in increased accuracy and economy, while at the same time providing for easy access to the collective data base thereafter.

Audiometry↗